18″ for Ceed petrol 140 hp

Hello, we would like to buy our KIA Ceed, Bj. Anf. 2019, Beniner 140 HP aluminium wheels. We would like to buy 18″ and then tires 225/40/18 – think that looks wide. Now I have looked at the well-known online providers, would have liked 2-3. ET45 were suggested for both axles. Can I buy the most beautiful ones for me now or do I have to have something done on the vehicle? I have never bought aluminium wheels, so far I always left the factory wheels d up 🙂 Lg, Markus